Not a bad start!
Some of the controls were a little frustrating, in particular the "weak spot" puzzles and the mouse look responsiveness. It was almost like it was laggy even though the framerate was good. Also your ceiling could probably have colliders ;)
A little more work on the controls and some real models and you have yourself a pretty decent little game!
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Yeah, I used the FPS controller from the Unity Standard Assets, which sadly, has a whole suite of features built into it. I suspect the camera issues might be because of that. It was a great option for going as far as I did in such a small amount of time, but yeah, it has it's issues. It worked more or less as intended, but it was a bit 'heavy' for the limited needs I had for it. It did add it's own step sound effects and such, which helped as well, so I can't say it was a bad choice, but it would be a better option to make my own FPS controller if I expand the game much further Thanks for the tips, though. :)